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A cascaded depth dehumidification method using microchannel rapid diffusion and nanowire adsorption

A microchannel and nanowire technology, applied in separation methods, chemical instruments and methods, dispersed particle separation, etc., to achieve the effect of good water stability and long life

Active Publication Date: 2021-08-13
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Taking molecular sieves as an example, ultra-low humidity air with a limit humidity of 0.01% to 0.05% can be obtained through the adsorption process. However, the molecular sieve wheel dehumidification system reported in the literature usually only reduces the humidity of the humid air to about 5%.

Method used

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  • A cascaded depth dehumidification method using microchannel rapid diffusion and nanowire adsorption
  • A cascaded depth dehumidification method using microchannel rapid diffusion and nanowire adsorption
  • A cascaded depth dehumidification method using microchannel rapid diffusion and nanowire adsorption

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Example 1: Construction of microchannel dehumidification unit

[0025] Carve grooves on the inner surface of the aluminum block as a gas flow channel, place the aluminum block upside down on the surface of copper or copper nanowires, place another smooth aluminum block under the copper sheet, and use bolts to fix the three and channel Sealing and constructing a metal or metal nanowire surface adsorption dehumidification unit. The width of the channel in the dehumidification unit is 2 mm, the spacing is 1 mm, and the height is 500 μm. The effective length of a single channel is about 150 mm. Six 3 mm through holes are arranged around the channel for bolt sealing. The size of a single unit is 40×40 mm.

Embodiment 2

[0026] Example 2: Preparation of Nanowire Surfaces

[0027] A 65-40-50000 double-pass AAO template with a diameter of 25 mm was used to prepare nanowire structures on the copper surface by a two-step electroplating method, and the surface morphology was observed by SEM tungsten filament field emission scanning electron microscope.

Embodiment 3

[0028] Example 3: Condensation phase change dehumidification at -4.6 °C

[0029] The experiment controlled the dehumidification temperature of the microchannel to -4.6 °C, and selected humid air with a relative humidity of 30% at room temperature as the experimental gas. The width of the microchannel was 2 mm, the height was 0.5 mm, and the length was 600 mm. Condensation phase change is dehumidified. In the experiment, the system was first heated and regenerated at 90 °C for 5 h to completely regenerate the system. Then, the Reynolds number of the flow in the channel was controlled to 19.53, and the change of the dew point of the outlet gas over time was recorded.

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Abstract

A stepwise deep dehumidification method using microchannel rapid diffusion and nanowire adsorption, specifically related to a process technology for preliminary dehumidification using dew point condensation phase transition in metal microchannels and further deep dehumidification by microchannel adsorption with nanowires, capable of Realize the effect of reducing the relative humidity of the gas to below 0.1% (20°C), which belongs to the field of ultra-low humidity regulation. The height of the two microchannels is not higher than 1 mm. The nanowire structure is electroplated by electroplating. The diameter of the nanowire is 1-1000 nm and the height is 1-50 μm. The invention utilizes the advantages of rapid diffusion of water molecules in the microchannel, and couples the adsorption characteristics of the nanowires to realize deep dehumidification.

Description

technical field [0001] The present invention relates to a stepwise deep dehumidification method, in particular to a process technology for deep dehumidification of humid air by using dew point condensation of water molecules in metal microchannels-microchannels with nanowires to absorb, and its main feature is to combine two kinds of microchannels Different dehumidification characteristics can reduce the relative humidity of the air to below 0.1% (20°C), which belongs to the field of ultra-low humidity regulation. Background technique [0002] With the development of industry and agriculture, the requirements for environmental humidity are increasing. The microelectronics industry, material preparation and processing and other fields even require relative humidity below 1%. Therefore, deep dehumidification of the air is required. At present, the mainstream dehumidification methods mainly include the following two types. One is cooling dehumidification, which lowers the tempe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/26
CPCB01D53/261B01D53/265
Inventor 马学虎杨思艳杨云峰兰忠郝婷婷李亚辉叶轩
Owner DALIAN UNIV OF TECH
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